The XOmail Maritime
Gateway relays messages between domains
connected via maritime communications
and procedures. An XOmail Maritime
Gateway is an XOmail Server with at
least one Broadcast or Ship-Shore unit.
A number of Broadcast
Units and Ship-Shore Units can be
defined on an XOmail Maritime Gateway.
The Broadcast Unit
handles the transmission (broadcasting)
of messages to ships. The Ship-Shore
Unit handles incoming messages from
ships. Thus, two-way connectivity
requires at least one Broadcast and one
Ship-Shore Unit to be defined.
The system offers two
filtering functions for reducing
All messages are subject to
automatic screening. Expired
messages are discarded and suspected
duplicates are halted.
Messages may be stopped for manual
review to determine the relevance in
the current situation.
Broadcast Unit functions are:
Ships may maintain reduced radio
watch. A broadcast schedule can be
established to ensure that messages
are only sent during watch hours.
Broadcast schedules can also be used
for time-sharing a broadcaster, by
allowing certain types of traffic
(e.g. NATO only) during certain
periods of the day.
To ensure that all called stations
will receive a message, Re-runs of
transmissions can be defined.
Broadcast Units log all broadcasted
messages in Traffic Lists. The ship
side uses these Traffic Lists to
determine whether all broadcast
messages are received or not.
A Ship-Shore Unit
handles incoming messages from ships. In
addition, a Ship-Shore Unit provides
functionality for automatic and manual
aerial switching as well as reception
quality assessment and control. A number
of Ship-Shore Units can be defined on
one XOmail Maritime Gateway.
The ship uses Working
Channels for sending messages to the
Maritime Gateway. A channel link must be
established before a message can be
sent. Channel establishment is either
performed automatically using CARB
procedures, or manually by an operator.
In addition, an Aerial Select Channel
can be used for directing/controlling
the antenna used for receiving messages